This change updates the DRA upgrade/downgrade test to attempt
downloading the "latest" Kubernetes release if the "stable" release
entry point is not available.
This should fix test failures for the time just before the release,
when master is switched to the next release, but stable release URL
is not yet updated.
As before when adding v1beta2, DRA drivers built using the
k8s.io/dynamic-resource-allocation helper packages remain compatible with all
Kubernetes release >= 1.32. The helper code picks whatever API version is
enabled from v1beta1/v1beta2/v1.
However, the control plane now depends on v1, so a cluster configuration where
only v1beta1 or v1beta2 are enabled without the v1 won't work.
